NAME

  FH_2ndOnly - check Fragment Reassembly (2nd fragment only)

TARGET

  Host and Router

SYNOPSIS

  FH_2ndOnly.seq [-tooloption ...] -pkt Fragment.def
    -tooloption : v6eval tool option

INITIALIZATION

  1. Ping to Target (create Neighbor Cache Entries, if not exist)
  2. Override Neighbor Cache Entries

TEST PROCEDURE

  Tester                      Target
    |                           |
    |-------------------------->|
    |   Echo Request (2nd)      |
    |                           |
    |                           |
    | (<----------------------) |
    |   No Packet               |
    |                           |
    |                           |
    v                           v

  1. Send Echo Request (2nd fragment)
  2. No Packet from Target

  Echo Request Data (original) is:

        IPv6 Header
            Version            = 6
            Traffic Class      = 0
            FlowLabel          = 0
            PayloadLength      = 1032
            NextHeader         = 58 (ICMP)
            SourceAddress      = Tester Link Local Address
            DestinationAddress = Target Link Local Address

        ICMP Echo Request
            Type           = 128 (Echo Request)
            Code           = 0
            Checksum       = (auto)
            Identifier     = (auto)
            SequenceNumber = 0
            PayloadData    = data repeat{0x1, 512}
                             data repeat{0x2, 512}

  Echo Request Data (2nd fragment) is:

        IPv6 Header
            Version            = 6
            Traffic Class      = 0
            FlowLabel          = 0
            PayloadLength      = 520
            NextHeader         = 44 (Fragment Header)
            SourceAddress      = Tester Link Local Address
            DestinationAddress = Target Link Local Address

        Fragment Header
            NextHeader         = 58 (ICMP)
            FragmentOffset     = 65
            MFlag              = 0
            Identification     = 32bit (Automatic generation)

        Payload
            data               = 512 octets from the back of ICMP Echo request

JUDGMENT

  PASS: No packet from Target
        Sent packet is discarded

REFERENCE

RFC2460

4.5 Fragment Header

   The following error conditions may arise when reassembling fragmented
   packets:

      If insufficient fragments are received to complete reassembly of a
      packet within 60 seconds of the reception of the first-arriving
      fragment of that packet, reassembly of that packet must be
      abandoned and all the fragments that have been received for that
      packet must be discarded.  If the first fragment (i.e., the one
      with a Fragment Offset of zero) has been received, an ICMP Time
      Exceeded -- Fragment Reassembly Time Exceeded message should be
      sent to the source of that fragment.